Consider a free neutron present in space. What can we NOT say about it ?

It is highly unstable decays into and electron and proton and neutrino Has a mean life of about 1000s decays into and electron and proton and antineutrino

decays into and electron and proton and neutrino

A free neutron present in space decays into and electron and proton and antineutrino with a mean life of about 1000 s (~15 minutes). This is called Beta decay.